语法填空题考查学生对单词词性和单词形式变化的掌握程度。单词形式变化主要有两种，一是词的形、数、式的变化，一是词的派生变化。
今天重点介绍单词词性的变化，一个单词可能有两个或以上的词性，例如important重要的，importance 重要性，importantly 重要，这个单词有3个词性，有的单词词性可能更多，在考试中如何选择词性就要根据文章提供的语境了做出选择。
如何提高此类题就要在平时多加练习和总结，学习方法更重要，下面给大家提供一种学习思路，助你能够高效学习，提高成绩。
( 1 ) 主要，主要部分；主要的；大部分
1. He is the __1__ character in the story.
2. Our __2__ meal is in the evening.
3. His money comes __3__ from business interests.
( 2 ) 管理，经营，设法完成；经理，管事人
1. The prime minister really __4__ the government.
2. He __5__ to escape to South America.
3. Mother hasn much money and it is only by good __6__ that she is able to buy all we need.
4. Only a good __7__ can run a household on fifty dollars a week.
( 3 ) 意思，意义，意思是
1. Whats the __8__ of this word?
2. The words are spelt differently, and __9__ quite different things.
3. Smoke usually __10__ fire.
4. Thoughts are expressed by __11__ of words.
5. Taking a plane is the quickest __12__ of getting there.
( 4 ) 医学，医疗，医药
1. __13__ research may find a cure for cancer.
2. Tuition, rooms, books, and __14__ care are all free.
3. This is a good kind of __15__ for colds.
4. Always keep __16__ where children can get at them.
参考答案：
1.main 2. main 3. mainly
4. manages 5. managed 6. management 7. manager
8. meaning 9. mean 10. means 11. means 12. means
13. Medical 14. medical 15. medicine 16. medicines
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